The factory air pump is around $300 in aftermarket/$360 dealer but be sure it is not pumping air before you spend this money because there are some vacuum lines and a couple valves before the air goes into the exhaust. There are a couple different fault codes for secondary air - since you dont know what the dealer did to troubleshoot, be sure. It is a lot of money to spend to keep the check engine light off.

If you undo the hose and the computer wants to run the air pump it should open the valve on the exhaust manifold too. So if you take the hose off from here you should hear the LOUD exhaust come out of the valve.

Did you find the round crankcase vent valve? This is in the $50 range at the dealer. There are copies on the aftermarket, but I don't know how good they are.

--
Ken Fister - Charlottesville, Virginia USA
97 328i, 95 540i, 97 Hino truck
bmwecu.org

• $900??? - bobcat2k 2008-05-14 13:25:18 (134 views)
  • Yes you can DIY.. air pump is easy - kfister 2008-05-14 18:54:06 (138 views)
    • Re: Yes you can DIY.. air pump is easy - bobcat2k 2008-05-15 08:01:38 (114 views)
      • Never seen a 4cyl but I have the book - kfister 2008-05-15 12:28:04 (99 views)
        • Re: Never seen a 4cyl but I have the book - bobcat2k 2008-05-19 15:19:32 (94 views)
          • Re: Never seen a 4cyl but I have the book - kfister 2008-05-20 09:37:37 (107 views)
            • Re: Never seen a 4cyl but I have the book - bobcat2k 2008-05-20 13:37:55 (84 views)
              • Re: Never seen a 4cyl but I have the book - tugman3461 2008-07-17 07:27:53 (38 views)